I smoke out of ____ habit, not for ____ pleasure; for I have been in the habit for twenty years.

A．a; the

B．the; a

C．x; the

D．x; x

胆囊（）

A.位于肝的脏面，左纵沟前部

B.一般为腹膜间位器官

C.其体表投影为右胸骨旁线与右肋弓的交接处

D.可分泌浓缩胆汁

E.右为胃幽门部、左为结肠右曲